Question Power outage, now no POST ?

[Champs17]

Last night we had an 18 second power outage (I looked up the outage report). I was using the PC at the time, and it had been running for 4 months without issue.

Now it won't complete POST. On the MB, the red CPU LED flashes for a split system, then the Amber DRAM LED comes on for about 10 seconds, then flashes red and amber again for 10 seconds. This repeats continuously.

I have done all the usual troubleshooting like reseated the RAM. Tried one, then the other RAM stick in different slots, No RAM. Removed the GTX, all peripherals, cleared bios each time. No change.

I don't have access to other RAM to test.

Do I buy new MB or new RAM?

 

[dwd999]

Only if you're sure its not the power supply.

 

[Champs17]

Only if you're sure its not the power supply.

AIO Cooler lights up and fans spinning. GTX 3080 lights up and fans. Even the MB lights up. Didn't consider the PSU could be the issue as It's only 4 months old.

 

[helpstar]

which motherboard and PSU is it exactly?

 

[Champs17]

Yeah, sorry.

Mobo: Asus TUF Gaming B760-Plus WiFi
CPU: I7-14700KF
GPU: RTX 3080 12GB Triple
RAM: 32GB TForce 5600 DDR5
PSU: Corsair SF850L

 

[DaleH]

AIO Cooler lights up and fans spinning. GTX 3080 lights up and fans. Even the MB lights up. Didn't consider the PSU could be the issue as It's only 4 months old.

The age of a component isn't necessarily indicative of anything. Measure the voltage with a multimeter or borrow a spare PSU.

 

[dwd999]

AIO Cooler lights up and fans spinning. GTX 3080 lights up and fans. Even the MB lights up. Didn't consider the PSU could be the issue as It's only 4 months old.

Its not the power dropping out; its the power coming back on. If there's a momentary surge when the power comes back on that could damage the power supply, similar to a lightning strike. That's why its prudent to have the power supply connected to a surge protector with the highest joule rate possible or a UPS with a high joule rate.

 

[Champs17]

I stole the son-in-laws PSU, and connected just the MB. Same result.

Swapped the RAM sticks and tried different slots, resetting CMOS each time.

Still a quick CPU led, the 10 seconds of DRAM light, the cycles back again.

 

[Champs17]

Is it possible that a MB called Tuf Gaming gets fried after its first power outage?

When I built my last PC, ASUS was a great brand. This thing has not impressed me at all.

 

[Exploding PSU]

Kind of a shot in the dark, but have you checked to make sure that you connected the 24-pin ATX connector properly?

A similar thing happened to me some time ago. A massive lightning struck close by and power immediately went out for hours... When it came back on, PC didn't even show any signs of life. Sometimes it would only react for a split second after pressing the power button before turning back off (the RGB flashed momentarily)... Replaced the PSU with two known good units, nothing. Switched the RAM with others I had lying around, also nothing. Even took the motherboard out the case as I was getting desperate.... Absolutely nothing, as if the power cord wasn't even connected.

Just when I was about to throw in the towel and send the entire PC for repair, I put everything back in, and noticed the "click" when I connected the 24-pin cable.. And it fired up first try without issue. Tried the other PSUs, also same thing... I didn't push the connector in properly every single time, turns out... PC still runs to this day, with the same PSU.

My old thread about this is probably still here somewhere. I say worth a try...

 

[bill001g]

Without lots of extra parts laying around it tends to be hard to figure out which part is bad.

It really depends on what you mean it was running for 4 months. Could just be the next time you turned the power off for whatever reason it was going to fail.

When I used to work in data centers they always had a few spare servers/switches/routers on hand when any scheduled power outage was done. It seemed that even though everything was running fine as soon as they shut off a group of racks something would not reboot.

Modern power supplies have a lot of protection circuits. Power issues tend to damage the power supply itself or the protection circuits. It takes something like a lightning strike to damage the computer itself.

Not sure what to suggest. You have 3 possibilities cpu/memory/motherboard and no easy way to guess which it might be.

How new is the machine. You might be better off just spending the money on new technology. You could buy a new cpu and motheboard and if the current memory is DDR5 you could try that on the new system before you purchased more memory. I guess you could also gamble and buy the memory first since that is the cheapest of the 3 things to try. Not sure I would do it if the memory is ddr4 almost everything new now uses ddr5

 

[Champs17]

I bought new RAM today. No change.

I borrowed a PSU yesterday. No change.

To answer @bill001g the CPU, MB, RAM & PSU are 4 months old.

 

[bill001g]

The motherboard and cpu are likely under a warranty then. Will still be a pain since they want you to ship them the devices and you are without the computer while they look at it. They of course will try very hard to find anything to say it is a user caused issue.